Lathe



(No Model.) 2 Shets-Sheet 1, W. HOUGHTALING.

Pate'nfed Aug. 26, 1890.

@E I v N v (No Model.) 2 sheets-sheen 2.

W. HOUGHTALING. LATES.

N0. 434.930. Patented Aug. 26, 1890.

UNITED STATES PATENT OFFICE.

WILLIAM HOUGHTALING, OF BRIDGEPORT, CONNECTICUT.

LATH E.

SPECIFICATION forming part of Letters Patent No. 434,930, dated August26, 1890.

Application iiled November l1, 1889. Serial No. 329,918. (No model.)

T0 all whom it may concern:

Be it known that I, WILLIAM HOUGIITAL- ING, of Bridgeport, in thecount-y of Fairfield and State of Connecticut, have invented certainImprovements in Screw-Machines, of which the following is aspecification.

My invention relates to that class of machinery commonly known asscrew-ina chimes, a form of lathe in which the work is held in a chuckand operated upon by various tools fixed in a rotary turret mounted on acarriage sliding in the bed of the machine in line with the axis of thespindle which carries the chuck, and also by tools iixed in tool-postscarried by a second carriage sliding at right angles to the first.

The object of my invention is to provide Ineans by which slidingcarriages may be speedily operated by hand or operated slowly and with apositive action7 as circumstances require.

In order to operate the carriagein conj unction with the turret, it mustnecessarily be moved a considerable distance in order to cause theoperation of the mechanism by which the turret is rotated, and it isobvious that a screw would operate too slowly for practical use.Therefore it is customary to combine with the carriages a hand-lever, arack and pinion, or equivalent mechanism for imparting long and rapidmovements thereto. The use of these carriage-operating devices is,however, attended withaseriousdifculty, particularly when using toolshaving a broad cutting-edge, in that it is impossible to maintain auniformly-steady pressure upon the work thereby. The result is that informing a piece of work-such as acasting-havinga hard scale upon itssurface requiring a considerable degree of pressure to force the toolthrough the scale, the tool will, on passing beyond the scale, enter thesofter portion of the casting with a shock which is very liable toinjure either the work or the tool itself. It is desirable that theforce necessary-to carry the tool forward during the cutting actionshall be slow and positive. I therefore combine with the carriage,havingthe usual lever or rack and pinion devices to advance the carriage andthe tool to the point where the cutting action commences, a screw-feedof peculiar construction for continuing the advance in a steady andpositive manner, the screwconnections being adapted to be throwninstantly into and out of operation at will.

The essence of my invention rests in combining with the carriage ascrew-feed of peculiar construction capable of being thrown instantlyout of action, and an independent feed for imparting a longer and morerapid movement; and it will be understood that the invention issusceptible of embodiment in various equivalent forms, which willsuggest themselves to the skilled mechanic after reading thisspecification.

i In the accompanying drawings, Figure lis a perspective view of theoperative d parts of an ordinary screw-machine having my improvementapplied thereto, the carriages being combined with the ordinaryhand-levers. Fig. 2 is an end elevation of the turretslide, illustratingthe manner of throwing the screwfeed into and out of action. Fig. 3 isan end elevation showing my improvement applied to a machine in whicharack-and-pinion feed is employed. Figs. fi and 5 are side elevations,illustrating my screw-feed in Various equivalent forms.

Referring to Figs. l and 2, A is the bed or base of the machine,supportingthe head-stock B, in which is mounted the main spindle b,carrying the chuck c, which carries the work to be operated upon-as, forexample, piece d.

C is the turret-slide block, mounted on the main frame and givingsupport to the horizontal turret-slide D, upon which is mounted therotary turret F., provided with tools l 2 3 4t 5 6, in the usual manner.The turretslide D is moved to and fro through the greater part of itspath, so as to cause the action of the turret-turning mechanism by ahand-lever F, pivoted to the slide D and fulcrumed in a swiveled piecef.

G is the cross-slide block, mounted on the main frame and sustaining thecross-slide H, carrying the tool-post J, in which the tool '7 ismounted. This cross-slide moves at right angles to the path of theturretslide and is operated by a hand-lever h, connected thereto in theordinary man ner.

Thus far the machine is constructed an operates in the usual manner.

Referring now to my improvement, K represents a horizontal stud fixed tothe turret- IOO slide block and threaded at its outer end.

lever, as usual.

On the threaded end of the screw-stud is mounted a nut L, fashioned intoa crank, so that it may be readily turned by hand. Pivoted to theturret-slide D is a notched latch M, which may be turned downward overthe screw-stud in position to be acted upon by the nut, as shown in Fig.1, so that the turning of the nut will cause the latch to carry theturret-slide and the tool forward toward the work, or turned upward outof action, as shown in dotted lines in Fig. 2, so that the slide is leftfree to be operated by the hand- The end of the screw-stud outside ofthe crank is provided with checknuts 7c 7c, to prevent the nut L frombeing Y turned backward any further than is necesaction.

sary to permit the latch to be thrown into These devices are intended tosave time and'labor in constructing parts in duplicate, and which admitof the carriage being always started by the screw from the same point. Y

The cross-slide block G and cross-slide are provided with a screwstud,nut, and latch similar to those above described. l

In Fig. 3 I have illustrated the turret-slide D, provided with a rack e,actuated by a pinion e on a crank-shaft e2, as usual. Myscrewconnections are used in connection with this slide in the same formand manner as in the preceding figures. The rack and pinion are in thiscase the equivalent of the hand-levers shown in Figs. 1 and 2. In Fig. 4the screw K is threaded into the`turret-slide block C and provided witha crank L on its outer end by which to turn it. The latch M is pivoted,as before, to the turret-slide D', arranged to turn downward intoengagement with an enlargement in the end of the screw. In Fig. 5 ascrew K2, provided with a crank L2, is tapped into the turret-slideblock C', as in the preceding figure; but the latch M2, instead of beingpivoted to the turret-slide D2, is mounted between collars on the screwand arranged to turn upward into a notch in the turret-slide.

It will be observed that in each of these forms the screw-connection maybe instantly thrown into and out of action.

In operating a machine provided with my improvement the latch standsnormally out of engagement, so that the tool-carrying slide may be movedquickly backward by the handlever or the rack and pinion. At the propertime the carriage is moved forward by the same means until the tool isnear the point at which it is to commence its cutting action, whereuponthe latch is thrown into engagement and the further advance of the tooleffected by means of the screw.

Having thus described my invention, what I claim is- 1. In combinationwith the toolholding slide of a screw-machine and the usual man! ualdevice for quickly moving the same, a screwfeed comprising a threadedrod, a crank sustainedl by the rod in such manner that it will advancewhen rotated, and a co-operating latch adapted to be engaged by thecrank when the screw-feed is in action and to be moved free of the crankwhen the screw-feed is to be rendered inactive, substantially asdescribed.

2. In combination with the tool holding slide and the usual manualdevice for quickly moving the saine, the fixed threaded rod, thecrank-nut thereon, and the co-operating latch adapted to be engaged byor disengaged from the n ut, as desired, substantially as described.

3. In combination with the tool-carrying slide, its support, thescrew-stud fixed to said support, the crank-nut, the check-nut to limitthe movement ofthe rst-named nut, and the latch.

In testimony whereof I hereunto set my hand, this 28th day of September,1889, in the presence of two attesting witnesses.

WILLIAM HOUGHTALING.

Witnesses;-

OscAR E. BENIGO, J No. H. WHITE.

